As the interaction between humans and IoT becomes more active with the development of 5G technology, the interest in wearable devices is also increasing. In particular, the market for portable smartwatches among wearable devices is rapidly increasing. JNTC is developing and commercializing products that can be applied to various wearable devices such as smartwatches, Internet of Things devices, VR, and AR devices, and various coating technologies, such as chromium deposition, optical filter and hard coating technologies that can enhance optical properties in certain frequency band.